Laminated transparent assembly with edge sealing means
AssigneePPG Industries, Inc.
InventorJohn E. Stefanik
Life of this patent
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Abstract
This invention relates to laminated transparent assemblies having novel composite edge sealing means of organic composition consisting essentially of a thin barrier layer of an organofluoro composition selected from the class consisting of fluorinated ethylene polymers and copolymers of fluorinated ethylene and fluorinated propylene having a high resistance to moisture penetration and a sealant layer and/or a cushion coat selected from the class consisting of polysulfides, silicones and fluorosilicones having an adhesive bond to the transparent lamina of the laminated transparent assembly and to the barrier layer and some moisture resistant properties to provide a composite edge seal that is suitably adhered to the marginal edge of the laminated transparent assembly.
Claims14
A laminated transparency comprising two transparent layers of rigid material selected from the class consisting of glass, polycarbonates, acrylic plastics and other rigid transparent plastics commonly used as a substitute for glass bonded together by an interlayer of given thickness composed of a material selected from the class consisting of polyvinyl acetals and polyurethanes, a composite edge sealing system comprising a thin barrier layer of a fluorinated polymer selected from the class consisting of fluoroethylene polymers and copolymers of fluoroethylene and fluoropropylene having a width greater than the thickness of said interlayer and bonded to the edge of said interlayer completely around the perimeter thereof and completely covering said edge of said interlayer and a sealant layer having greater adhesion to the edge of said transparency than said barrier layer and composed of a composition selected from the class consisting of polysulfides, silicones and fluorosilicones at least coextensive in width with said barrier layer bonding said barrier layer to said transparency in such a manner as to improve the strength of the bond between said barrier layer and the edge of said interlayer.
A method of forming a laminated transparency comprising two transparent sheets of rigid transparent material selected from the class consisting of glass, polycarbonates, acrylic resins and other rigid organic materials usually substituted for glass, bonded together by an interlayer composed of a material selected from the class consisting of plasticized polyvinyl acetals and polyurethanes and a composite edge sealing system comprising a thin barrier layer of an organic fluorinated polymer selected from the class consisting of fluoroethylene polymers and copolymers of fluoroethylene and fluoropropylene comprising assembling said rigid sheets and said interlayer to form a sandwich, enclosing the entire marginal edge of said interlayer within a tape of said organic fluorinated polymer, enclosing the periphery of said sandwich and said tape within a cushion layer of a composition selected from the class consisting of silicones and fluorosilicones adherent to said tape and to said rigid transparent material to form an assembly, inserting said assembly in a bag, evacuating and sealing the bag, and subjecting said bag and said assembly to an elevated temperature and pressure sufficient to seal said barrier layer to the marginal portion of said interlayer and to bond said rigid sheets to the opposite surfaces of said interlayer and to bond said cushion layer to said barrier layer and said rigid sheets.
A method of forming a laminated transparency comprising two transparent sheets of rigid transparent material selected from the class consisting of glass, polycarbonates, acrylic resins and other rigid organic materials usually substituted for glass, bonded together by an interlayer composed of a material selected from the class consisting of plasticized polyvinyl acetals and polyurethanes and composite edge sealing system comprising a thin barrier layer of an organic fluorinated polymer selected from the class consisting of fluoroethylene polymers and copolymers of fluoroethylene and fluoropropylene extending around the edge of said transparency comprising assembling said rigid sheets and said interlayer to form an assembly, inserting said assembly in a bag, evacuating and sealing the bag, and subjecting said bag and said assembly to an elevated temperature and pressure sufficient to bond said rigid sheets to the opposite surfaces of said interlayer to form a laminated assembly, removing said laminated assembly from said bag, applying a sealant layer of a composition selected from the class of silicone rubbers and polysulfides that cure at room temperature to the marginal edge of said laminated assembly that results from said exposure to elevated temperature and pressure, applying a tape of said oganic fluorinated polymer around the entire marginal edge of said laminated assembly in alignment with the edge of said interlayer, and curing the assembly that results at room temperature.
Dependencies are inferred from the claim text.